Biaxial alignment control of YBa₂Cu₃O_7−x films on random Ni-based alloy with textured yttrium stabilized-zirconia films formed by ion-beam-assisted deposition

Abstract

Biaxially aligned YBa2Cu3O7−x (YBCO) films were fabricated on random Ni-based alloy tapes with yttrium stabilized-zirconia (YSZ) buffer layers deposited by ion-beam-assisted deposition (IBAD). Ar+ ion bombardment was found to have two significant effects on the crystalline structure of the YSZ buffer layers: to align a [100] axis with the substrate normal and a [111] axis with the bombarding beam axis. The resulting YSZ films were biaxially aligned on the random polycrystalline tapes, and the azimuthal distribution of the a- and b-axes of YBCO films on the top of the YSZ films was restricted to 10° FWHM. A critical current density (Jc) of 1.13 × 106 A/cm2 (77 K, 0 T) was obtained, and 1.1 × 105 A/cm2 was maintained at 5 T (77 K, B⊥c). The existence of both intrinsic and extrinsic pinning properties was clearly observed in the angular dependence of Jc with B⊥I. The longitudinal field effect on Jc was clearly observed, which indicated straight transport currents. This is evidence for strongly coupled current paths that demonstrate the bulk pinning properties of YBCO.

Growth structure of yttria-stabilized-zirconia films during off-normal ion-beam-assisted deposition

“…19 The assisting beam was essential even for crystallization and out-of-plane alignment. Evolution of crystalline alignment during growth [100] fiber textures were clearly observed in contrast with ones of films grown by a simple IBS without the assisting beam.…”

Fluorine-free propionate route for the chemical solution deposition of YBa2Cu3O7−x superconducting films

“…The clue towards the fabrication of 2G-HTS tapes is the epitaxial deposition of YBCO thick films on a biaxially oriented oxide template built on flexible metallic substrates [1][2][3][4][5]. The final YBCO film must meet stringent requirements, such as: a high degree of epitaxy, uniformity across the width and along the length ($ 10 3 m) of the tape, as well as excellent mechanical properties.…”

Inclined Substrate Pulsed Laser Deposition of YBCO Thin Films on Polycrystalline Ag Substrates

“…A promising material for future electric power applications is YBa 2 Cu 3 O 7-x (YBCO)-coated conductors [1][2][3][4]. Recently, YBCO thin films grown on silver tapes have attracted much interest because of their high superconducting transition temperature (T c ) and high critical current density (J c ).…”